matrix: camera HAL uses [^/]+/[0-9]+ instance.

Use regular expression. Camera HAL is an optional
HAL so this does not break OTA.

Bug: 73738616
Test: builds
Test: vts_treble_vintf_test (compatible and No deprecate HALs)
Change-Id: Idf2b8cbe49f5a913df744833147bb1c48588c956
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 370ffdd..c2d1448 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -76,7 +76,7 @@
         <version>2.4</version>
         <interface>
             <name>ICameraProvider</name>
-            <instance>legacy/0</instance>
+            <regex-instance>[^/]+/[0-9]+</regex-instance>
         </interface>
     </hal>
     <hal format="hidl" optional="true">